1. Associate Professor, Dept. of Mechanical Engineering, Virginia Technical University, Blacksburg VA 24061-0238.
2. Professor, Dept. of Civil and Environmental Engineering, Virginia Tech Univ., Blacksburg, VA 24061.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Albrook Hyd. Lab, Washington State Univ., Pullman WA 99163-2910.
4. Senior Project Engineer, HEC Inc., 5565 Sterrett Place, Suite 400, Columbia, MD 21044.